You are quite limited in tire size and I would recommend getting a set of squared Apex rims ( save you a ton of weight too as those are heavy rims) in 18x10s or 18x11s, as this will give you a broad range of competitive tires to use. Contact Apex at their site linked on the sidebar of this Forum.

+1 to what Bill said.
For road racing, these cars need as much tire as you can afford, and square setup.
You can get a 315/30/18 on an 18x11 no issues (what I run), which is about as wide as you can go with tires on these cars before having to do bodywork.

the problem here is not the wheels.. im facing a problem with finding tires... and im really struggling with the tires and tire size.. here we dont have a big range of tire and sizes

even for the 18x10 or 18x11 ... please help me figure out the things i would like to know to have an idea of tire size range in comparison to wheels .. and the oversized and undersized wheels i would like to get this kind of knowledge so i get the idea for future

Since you are not sure about tire size and how they compare to the rim size, you might use the resources at www.tirerack.com. There is a link on the Forum page quite often and you will be able to check a tire, see what sizes it comes in, and then click on the word , Specs, and it will give you what you are asking , a range of widths a specific tire will fit.

Let us know what tires you have available and you may have the option of getting tires from Europe or the United States. I know we used to send Hoosiers to one of our customers in UAE, though I imagine that is quite expensive?

As the above guys mentioned, 11" front wheels when combined with extended wheel studs and a 20-25mm spacer is the hot ticket for track use. Both 18" and 19" offerings work well, mainly comes down to what tire you'd like to run. Generally speaking, 275-285 is perfect on a 10" wide, and anything from 295-315 works well on an 11" wide. Personally wouldn't consider anything smaller than a 275 tire on these cars.

The "cons" of going undersized would be of course less grip. But this can also lead to understeer, and in turn more tire wear (shoulder chunking, etc).

This (https://www.wheel-size.com/calc/) is the best tool I’ve found for sizing wheels and tires on any vehicle. It’s free, easy to use, and you can crawl over your car with a tape measure and enter the info. You can see before you order exactly how the set-up you choose will fit.

18’s will always be the more popular choice, if for nothing else than weight, tire option, and cost.

19’s are a good option for style, as they will fill up the wheel well and still perform better than your OEM wheels, because the offerings from Apex are lighter, stronger, and wider.

Really, the decision I struggle with is square vs staggered. A squared setup will be easier to live with daily due to the ability to rotate from front to rear. A staggered setup is the impossible cool, however.

+1 to what Bill said.
For road racing, these cars need as much tire as you can afford, and square setup.
You can get a 315/30/18 on an 18x11 no issues (what I run), which is about as wide as you can go with tires on these cars before having to do bodywork.

Click to expand...

Why do these cars “need” a square setup? Is it an understeer issue, or something else?

I love a staggered setup, and I want to go that route, but don’t want to compromise on performance.

Feel free to correct me if I’m wrong, as I admittedly don’t know everything about this car and how it performs on the track, but I would think that moving from OEM to, say, a 19x10 F and 19x11 R would still show a great benefit traction wise, and not change the handling characteristics or balance of the car too much from stock.

I have 10" front 295/30 and 11" rear 305/30, these 295s run as wide as a lot of 305s. It is a big upgrade from OEM but even with that its terminal cornering state is push, or understeer. It's a front heavy car and there's less tire on the front than the rear to carry that weight. I can drive around it, but I know I am sacrificing g's.

I'm not racing, but I am trying to get the most I can out of the car and I know with the staggered setup I'm not there. I'm not sure working on spring rates/sway bars/shock settings could cure this either, certainly not cheap to do it that way, so it just seems the easy button is more front tire. So this year we're going square 11" 305/30s, have everything installed and ready to go, just waiting for the snow to disappear to road test things.

AZ Boss's notation above should read Squared, not Staggered. Just a little slip, but he will probably take it in stride, though being corrected by an old racer on Social Security may tick him off, ha,ha!

Seriously, just a typo, and I have done far worse , but his answer is simple and correct! AZ Boss is my hero, so got to tease him a tiny bit once in awhile!